Engraving-machine.



E. R. MULCHAHEY.

ENGRAVING MACHINE.

APPLICATION FILED APR. '27, l9l7.

Patented Aug. 27,1918;

4 SHEETS-SHEET I.

l I I I I l l l I rm: mum's psrms m. PNOTO-LITMKZ. WASHING mu. 0. c

E. R. MULCHAHEY.

ENGRAVING MACHINE. APPLICATION FILED APR. 22. Hill.

1 ,276,793 Patented Aug. 27; 1918.

4 SHEETS-SHEET '2.

E. R. MULCHAHEY.

ENGRAVING MACHINE.

APPLICATION man APR. 27. 1911.

Patented Aug. 27, 1918.

4 SHEETS-SHEET 3.

ms Nanms PETERS co.v PHLWD-LIYHIZ. wasmuc or: u c,

E; R. MULCHAHEY.

ENGRAVING MACHINE.

APPLICATION FILED APR 21. 1917.

1,276,793. Patented Aug. 27, 1918.

4 SHEETSQSHEET 4.

6. @175 INVENTOR TTORNEY rm: uorarus PETERS c0 4 PnOnrLHND" WASHING mm. a. c.

same err on.

EARLVB. MULGHAH Y, enriaoviniincn, RHOIDE ISLAND.

ineniivme-ivmon nn I Specification of Letters Patent. Patgnted Aug. 27, 1918.

Application filed April 27, 1917,. Serial No. 164,878.

To all whom it may concern:

Be it known that I, EARL R. MULoiiniinY, a citizen of the United States, residing at Providence, in the county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Engravingh lachines, of which the following is a s1 ccification.

My invention is an improved engraving machine for reproducing ornamental patterns on fancy buckles, 1 cigarette cases, match-boxes or other like articles of; utility or ewelry. The object of my in'iprovement' is to'provide an automatic mechanism for transferring designs from a pattern to the article with a straightdine engraving operation to produce a brocaded effect on the To this end my mvensurface of the piece. tion consists particularlyof means forcausing a. stylus or tracer to travel across the pattern and to communicate its motion to the graver or cut-ting-toolto cause the latter to reproduce the design in proportion to the size of the space to be ornamented. My improvement further contemplates the employment of means for adjusting the ratio of movement between the stylus and gra-vcr and for regulating the ratio of feed between'the pattern'and the work in accordance with the size of the piece being operated upon as more fully explained hereinafter. I i

The manner and means for carrying out the improvement are fully described in the following specification, illustrated by the accon'ipanying drawings, in which like reference characters designate like parts. In the drawings 1 g Figure 1 is a plan view of my improved engraving inachme;

Fig. 2, an elevation of the-driving-conncctiens for the reciprocating patternand work-supporting carriages;

Fig. 3, an enlarged, plan view of the operating-connections between the stylus and gravei', also showing their proportionate feediiig mechanism with itschangegear an rangement;

Fig. at, an enlarged, front elevation of the same; 1 r

Fig. 5, an enlarged, end elevationof the Fig. 6, a part sectional view taken on the line XX of Fig. 3, looking in the direction.

indicated bythe arrow 00 Fig. 7, a detail view of the ratchet-mechm.

nism for the feed-shafts of the machine;

Fig. "8, a face view of the pattern-plate showing a conventional design for reproduction; 7 i

Fig. 9, a similar view of the piece on which the pattern design has been reproduced by engraving with the straight-line method to give the brocaded effect.

-- Referring first to Figs. 1 and 2, the operat ing-mechanism of the machine is mounted on a base or table B which may be. supported from the floor by suitable legs or standards not here shown. Bolted to the top of the table B are two upright-s or brackets C and Dwhich support the ways or tracks for the gertically-reciprocable patternand workcarriages E and F. The bracket D is :provided with a bearing (Z for a horizontal shaft- Svwhich is journaled at its opposite end in a. bearing in a vertical standard G. The shaft S carries a pulley or drive-wheel H which may be connected by a belt h to another manually-rotatable pulley, not here shown, or, if desired, might be driven from the powershaft of a motor or other prime-mover. On the rearward end of the shaft S is a gcarl through which it is connected to d'rivenn opposite, parallel shaft S. The shaft S is j our'naled at its forward end in the bracket C for-the pattern-carriage E, and at its op posite end in an upright bracket J. On the rearward end of the shaft S is agear K arranged. in the same plane with the gearl on the shaft S. The gears I and I are connected by a change-gear L journaled onea stud Z carried at the end of an arm L which more particularly in Fig. 2 the arm If is securedto the bracket J by means of a bolt passing through a slot j to provide f adj usting the position of the gear L. Through this arrangement the elia-iigegeai's L may be displaced by others ofgreater diam at #10 alter the ratio of speed between the shat and The purpose of this specdchange connection between the shafts S and S isto provide for adjusting the ratio of n'iovcnie nt between thc pattern and the work in proper- 7 tion to the size'of the piece to be engraved, as more fully explained hereinafter.

."The'. pattern-carriage E consists of a fiat,

rectangular plate formed wit-libeveled edges e,e fitted-to slide in the grooved tracks 0, c

which are screwed to the front of the bracket C. Secured to the rear face of the plate or carriage E is a vertical rack-bar R formed with teeth 1' adapted to mesh with the teeth of a small gear or pinion N which is fast on the forward end of the shaft S. As shown in F ig.- 1, the work-carriage F is of simllar construction and arrangement, consisting of a bevel-edged plate fitted to slide 011 the vertical tracks 05, (Z on the front of the bracket or standard D, and carrying a rackbar O engaging with a pinion M on the shaft S. V hen the shafts S and S are rotated from the wheel H the pinions M and N will travel the'racks Oand R to slide the carriages F and E up or down on thelr tracks orv ways in accordance with the direction of rotation of the wheel. The ratio of movement between the two carriages during this operation is differentiated by the rightand left-hand threads at their oppo:.

site ends and with square heads t, t arranged centrally thereof. The forward ends of the studs t, t are threaded through a face-plate or support T against which the pattern. P is clamped. The pattern P is se cared to the'face-plate T by means of the clamp-fingers U, U which are tightened thereagainst by the screws u, u, see Figs. 3 and &. After thepattern has thus been fastened in place it is trued or squared up in relation to the stylus by adjusting the studs 3', t toregulate its position on the carriage E. The pattern P is usually made in the form of a plate or block, generally of hard rubber, or in some cases of metal, having its face recessed or cut away to bring out the design in relief. Fig. 8 illustrates the pattern P as of a simple design consisting of a raised Greek cross, but in some cases it may be much more complicated in outline.

I Usually the article to be engraved is relatively flat on its face and in the case of a belt-buckle or similar ornamental medallion it may be simply a thin metal plate or disk. For attaching the plate or work lV-to its carriage F, I employ a chuck or holder V of any suitable type such, for instance, asthat illustrated in- Figs. 1 and 3. As here shown a block V is mounted on the front of the plate F and provided on its face with a horizontal slot 1) for receiving two sliding clamps or cleats Y, Y. The clamps Y are adapted to be adjusted toward or away from each other by means of a rightand lefthand thumb-screw g extending through them and anchored in a hearing? at one end. The Work or plate WV seats against the front faces of the clamps Y, Y, as shown in Fig. 3, and is clamped thereto between the raised ledges Z, Z which engage its edges. In this manner, or through the use of any other suitable holding-means, the work W is clamped fixedly in place at the front of the sliding carriage F to move therewith.

Referring to Fig. 1, the stylus 2 which traces over the pattern P and the graver or tool 3 which engraves the work are supported by horizontally movable carriages or slides +1 and 5, respectively, mounted to adapt them to be fed laterallv of the pattern and work or transversely of the machine. As shown more clearly in Figs 3and 4r, at the left-hand side of the bed B is a cleat 6 for supporting the ends of two parallel, longitudinal strips or guiding-tracks 7 and 8. At the right-hand side the tracks 7 and 8 are mounted on cleats 9 and 10 projecting from the top of a plate 12 secured to the bed B by any suitable means not here shown. The tracks 7 and 8 serve as horizontal ways on which the carriages 4 and 5 slide while guided by beveled cleats 13 and 1a screwed to their under sides as shown in Figs. 5 and 6. Journaled in bearings in the cleats 9 and 10 1s a screw-shaft 15 carrying a pinion 16 fast on its left-hand end.

The pinion 16 meshes with a gear 17 rotatable on a stud 18 screwed into the side of the. cleat 9. The gear 17 is keyed to or formed as a part of a hub 19 at the opposite end of which is a gear 20. The gear 2-0 meshes with a pinion 21 fast on the end of a screw-shaft 22 which is j ournaled at one end in a bearing (5 fastened to the under side of the tracks 7 and 8. and at the opposite end in the cleat 6. The two shafts 15 and 22 are arranged in axial alinement and are driven one from the other at different speeds through the connecting-gears 16, 17, 20, 21. By unscrewing the stud 18 the gears 17v and 20 may be removed and replaced by gears of different diameters with a greater or less number of teeth to alter the speed ratio between the two shafts 15 and 22. For this purpose the pinions 16 and 21 'on the shafts 15 and 22 may also be removed and replaced by gears of differentdiameter so that the distance between centers will remain the same. As shown in Fig. 3 the pinions 16 and 21 are secured to the ends of the shafts l5 and 22 by nuts 23 and 2-1: which may be unscrewed to provide for the re moval and shifting of the gears. Referring to Fig. -.l:, the shaft 15 is threaded through a lug or block 25 fixed on the under side of the carriage 5 between the tracks 7 and S, and the shaft 22 is likewise connected to the carriage l; bymeans of the lug 26. Through this arrangement the turning of the shafts will cause the carriages a and 5 to travel longitudinally of their tracks or ways, both in. the same direction, but at different rates "pawl 30.

3, of two pivot-studs 39, 39. The studs 39 areof speed, as morefully explainedhereinafter.- l

'The two connected feed sha'fts15and 22 are adapted to be operated manuallythrough the means of a crank-handle 27f fast on the end of the shaft 15. Between'the shaft- "bcaring or cleat and the crank 27 is a ratchet wheel or disk 28 formed with V- 'shaped notches 29 on its periphery, vsee Fig.

7. A pawl or lever 30 is pivoted at 31 on the end of the plate 12 and carries a roll 32 at itsend adapted to engage the notches 29 of the ratchet 28. Bearing againstthis' end of the lever 30 is a flat spring 33 fastened at 33? to the end of the plate 12. The spring 33 tends to maintain the lever 30 With 1iiS11Cl pressed toward the ratchet 28 while allow ing the 'roll'f32 to ride in and out-"0f the notches 29. A curved arm 34 on the opposite end'ofthe lever 30. provides a' handle for releasing it from the ratchet to allow for a free turning movement of the feed-shafts.

The purpose of this pawl-and-ratchet dev ice,

is to control the rotation of the shafts 1'5 and 22 under the action of the crank '27 whereby a predetermined movement of the carriages 4 and 5 may be effectedin accordance with the number of notches turned past the Referring now, to Figs. 4 and 5, two arms '35, 35 extend upwardly from the carriage 4 and between their upper ends is pivoted a. bell-.crank-lever 36..The bell-crank 36 is formed with a hub 37 having conical reccsses38, 38 countersunk into its sides, see adapted to receive the/pointed ends screwed through the arms 35, 35 with their points bearing against the hub 37 to provide a delicate and sensitive pivot for the lever 36. [i Two check-nuts 40, 40 on the ends of the studs 39 prevent thenrfrom becoming 'looselwhile.allowing for adjustment to coinpensate for wear. Referring. particularly to Fig. 5, onearm 41 of the lever 36 extends downwardly from the hub 37 and at its lower end is formed with a bore or, bearing 42 for tlie'stylus or tracer This latter consists simply'of a round rod heldin the bore of the arm' 41 by'a set-screw 43 and formed with pointed ends. 'As here shown the point at one end ofthe stylus is somewhat blunt while at the opposite end it is sharper to adapt it for tracing either bold or line designs, By looseningthe set-screw 1-3 the stylus may be removed and reversed .in position, end forend, or when the points become worn it may be taken out .and reground. The upper arm of the bell-crank 36 consists of a round rod 44 bent in arou- ,ate shape and heldin a radial bore in the hub 37. Fitted to slide along the arm 44 is a split collar or clamp nember 45 wh chfis fsecuredlin position thereon by means of a binder-screw 46, see also Fig. 3. Pivoted.

of the mechanism as next described.

to a lug on the'underside of the collar 45 is a link 47, the lower end of which'is pivotally connected to an arm 48 projecting radifally from a hub or collar '49. The'collar 49 is slidable on a horizontal rock-shaft 50 which extendsthrough bearings 51 in the upright arms 35 of the carriage 4 and is journaled at its opposite end in a bearing 52 on the carriage 5. The end of the shaft 50 by a key 57 on the end of the arm 48, see

.5. Referring to Figs. 3 and 5, it will be seen that as the point of the stylus 2 is caused to follow in and out across the raised portions of the pattern P it will be given a longitudinal, oscillating motion which acts to rock the bell-crank-lever 36 on its pivot. This rocking motion of the lever 36 is communicated through its arm 44, link 47 and the arm 48 on the collar 49 to rock the shaft 50 which is keyed thereto. During this oscillation of the shaft 50 the carriage 4 which carries the stylus 2 may be displaced in relation to the tool-carriage 5since the collar 49 is free to slide longitudinally of the shaft 50.

The rocking motion of the shaft 50 acts 6 to operate the tool or graver 3 in relation to the work through the arrangement As shown. in Fig. 3 the graver takes the form of a round rod having its end chamfered or ground down to a point in accordance with the usual practice. The graver 3 is mounted to slide in a bore 59 of a head or hearing 6O projecting upwardly from a plate-like slide or cross-carriage 61. The slide 61 is beveled on its sides, see Fig. 4, and fitted between the oppositely-beveled tracks or ways 62, 62 screwed to the top of the main carriage 5. Through this arrangement the slide 61 may be moved 011 the carriage 5 at right-angles to the direction of feed of the latter to carry the point of the graver 3 V a ainst the work V or to withdraw it therefrom. This operation is performed inannally and to provide for the convenienceof theoperator in movingthe slide 61 afirigerest the front of the machine, see: Figs. 3, 4

and 6. Arranged parallel withthe tool or graver 3 is a gage or limit-member 64 held in a bore 65 in the bearing 60 of the slide 61.

'hold or handle 63 is formedon its end near As shown in Fig. 3, the forward end of the gage 64 is flatted off and bent around'in a horn-like prong or extension 66 with its point arranged in close proximity to the point of thetool 3. The rounded side of the prong 66 is adapted to bearagainst the face of the work V to limit the forward movement of the slide 61, to gage the position of the tool 3 in relation thereto. Through this means the slide 61 is maintained in such relation to the work as to insure that the tool will out to the proper depth in engraving the lined portions of the design, and that it will clear the face of the work where no lining is to be done thereon. The gage 64 is adjustable in its bore 65 in thehead or bearing 60 to set it in, relation to the point of the tool 3 through the means as next described: A pin'67 driven into the top of the bearing 60 engages a slot 68 in the side of the gage 64 to hold the latter from turning in its bore 65, and screwed into a threaded hole in its end is a stud 69 arrangedaXially thereof. Thestud 69 is held from longitudinal movement in its,

bore by a pin 70 engaging a peripheral slot 71 at its end while allowing it to be turned within the end of the gage 64. The end of thestud 69 projects through the front of the bearing 60 and is provided with a cross-slot 72 for receiving a screwdriver. Through this means the stud 69 may be turned to adjust the gage 64 longitudinally of the bore 65 to set its prong 66 in relation to the point of the graver 3, and a set-screw 73 is then screwed down against the gage to secure it against unwarranted displacement.

The graver 3 is normally forced outwardly toward the work W under the tension of a coiled spring 74 held in a pocket 75 at itsrearward end and bearing against a stud 76 screwed into the end of its bore 59, see Fig.3. The graver 3 is operated positively against the action of its spring 74 to withdrawrits point from the face of the work W by-means of a bell-crank-lever 77, see Fig. 6. The lever 77 is pivoted on a stud 78 screwed into the side of the bearing 60 and is formed with an upright arm 7 9having a fork 80 at its upper end. The sides of the fork 8O embrace a pin 81 driven into the side of the tool 3 and projecting through a slot 82 in the side of the bearing 60; On the other arm 83 of the bel1-cranklever 77 is a crank pin 84 through which it may be rocked to slide the tool 3.

The lever 77 is operated from a rockable frame 85 connected to be moved from the rock-shaft50,see Figs. 3 and 4. The frame l ce Shaft.

piece 62, see also Fig. 6, with set-screws 92, 92 securin' them in place. Projecting from the side of the rod 86 of the frame 85 is a rod or pin 93 adapted to be engaged by an arm 94 secured to the rock-shaft 50. The arm 94 projects from a hub 95 encircling the shaft 50 and held in position by the setscrew 96.. Through this arrangement the arm 94 maybe adjusted longitudinally of the rock-shaft 50 to vary its operative effeet on the frame 85 by shortening or lengthening the leverage of the pin 93. The opposite rod 87 of the frame 85 bears on the top of the crank-pin84 ofthe bell-cranklever 77, Which latter is free to slide longitudinally therealong during the movement of the slide 61. It will be seen that as the shaft 50 is rocked to raise the end of its arm 94 the latter will act against the pin 93 to rock the frame 85 to carry its side 87 thisaction the'frame 85 will rock the bellcrank-lever 77 to slide the tool 3 back from the work TV.

ride underthe end of the lever 55, which is fast on the end of the rock-shaft 50 as previously described, when the slide 61 is withdrawnaway from the work. The purpose of this arrangement is to rock the shaft 50 to operate the bell-crank 36 to withdraw the stylu 2 from the face of the pattern P when the tool is removed from the work, as more fully explainedhereinafter. The .method of operation of the complete mechanism is as follows:

To prepare the machine for operation the slide 61 is first drawn back to remove the tool 3 from proximity with the work-holding chuck V, see Fig. 3. .As the slide 61 is thus retracted by the operator through the means of the hand-grip 63, the wire elbow 97 on its side rides in under the lever 55 on the shaft 50 to lift its end. This action serves to rock the shaft 50 in the direction indicated by the arrow 100, Figs. 5 and 6, thereby raising the outer end of the arm 48 which projects from the collar 49 on the The arm 48 acts through the link 47 to rock the bell-crank-lever 36 in the direction indicated by the arrow. 102, Fig. 5, and the stylus or tracer 2 will thereby be withdrawn rearwardly from the pattern holding faceeplate T. With the stylus 2 and graver 3 thus withdrawn from operative position the pattern P and work W may be more conveniently adjusted in place on their carriages E and F. This is accomplished bysetting the pattern, P against thefaceplate T on the carriageE. and securing it thereto with the clamps U; whi1e the work .85 downwardly. see Figs. 3 and 4. Through W' or other article to 'be engravedis fastened in the chuck V in the manner as previously explained. The slide 61 then pushed forward again until the rounded horn 66 of the gage 64f bears against the face of the work W, as shown in Fig. 3, and this action causes the release of the lever on the rock-shaft 50 so that the stylus 2 is allowed to swing back into operative relation with the pattern P, see also Fig. 5. The face-plate Tis next adjusted by means of its holding-screws t, 1 see Fig. 1, to square the front face of the pattern P with the point of the stylus 2, and with the latter bearing against the raised portion of the pattern-block. as shown in Fig. 3, the gage (it is set so that the point of the tool 3 will just clear theeface of the workVV.

lVith the parts of the mechanism adjusted in this relation the operator grasps the crank or handle 27 and rotates the feed-shafts 15 and 22, through their intermediary gears 16, .17, 20, 21, to travel the two carriages and 5 into starting position. Usually the carriage l is adjusted to the left-hand eX- treme of its traverse to bring the stylus 2 into position opposite the left-hand margin-a1 edge of the cut out portion of the pattern illustrated by the dash-lines pp in Fig.- 8. The stylus 2 and graver 3 are again retracted out of the way by drawing the slide 61 back as previouslydescribed, and the shaft S is then rotated by means of the belt-wheel E and its connections, toturn the opposite shaft S, whereby to raise the pattern P and worklV into startingposition. The shafts S and S are rotated in the direction indicated by the arrows s, s, Fig. 2, to cause the pinions M and N to travel the racks O and R upwardly and in this manner the work-carriage'F and pattern-carriage E are both raised until the pattern P is'b'rough't into starting position with the stylus 2 oppos te its left-hand lower corner on the line 72 p p. The mechanism is now ready for operatlon and the slide 61 is pushed forwardagaln to bring the gage 64: against the face of the Work W. As the stylus 2 bears against the raised marginal portion of the pattern Pit will hold the bell-cranl': 36 in such position that the arm on the connected rock-shaft 50 will be raised against the rod 93 on the frame to depress its rod 87 slightly. The rod 87 is thereby brought down against the cranlepin Set to rock the bell-crank-lever 7 7 to hold the tool 3 against the action of its spring 74. In this manner the tool or graver 3 is held retracted with its'point just clear of the face of the work W. To start the engraving or lining-in of the design the operator now turns the wheel H in the opposite direction to that first described to rotate the shafts S and S in the direction opposite to that indicated by the arrows, s, 8,

.of the hand on the slidetl.

recessed or cut-out portions of the pattern Fig.2, and the racks o and new thereby be traveled downwardly to slide the carriages E and F in thesame direction. The pattern P. is thus caused to traversedownwardly in relation to the stylus 2 and the. work V will also-.lnove downwardly in relation to the tool 2, but at a different rate of speed in accordance with the difference in their dimensions, as provided for by the differential gearing betweeinthe shafts S and S Usually the pattern therefore move twice as fast as the workcarriage F, the gearing I, L, K havinga ratio of two to one. hen, however, a piece of different size is to be engraved from the same pattern, the change-gear L is displaced by another of the approximate number of i V teeth to give the correct ratio in proportion thereto. In this way a single pattern block may be used for reproducing the design in various dimensions in accordance with a wide variety of work. J A

i As the pattern is traveled downwardly the gage 64 is maintained in contact with the face of the work by a slight'pressure come opposite the point of the stylus the Now, as the 7 latter will follow into the depressionsto allow the tool 3 to cut intothe work. Non mally the stylus 2 is held inpendu'lous relation at the front of the pattern P with its point bearing against the raised portions of its face. WVhen, however, the pattern P is moved to a position with a recessed portion of its .faceopposlte the stylus 2 the point of the latter will be projected inwardly in relation thereto, due'to thebalance of th'e'bell-crank-lever 36. The weight of the arm M and the parts connected thereto is sufficient to rock-the arm 41 of the bell-crank toward the pattern to cause the stylus 2 to be projected into its recesses. As the stylus 2 thus follows in and out in accordance with the conformation on the face of the pattern its movement is communlcated through the bell-crank 36 to rock the shaft ,50. The shaft 50, inturnftilts the frame 85 on its pivots and this action allows a rocking motion of the bell-erank-lever 77. The bell-crank-lever. 77 is rocked under the action of the spring 74- which operates against the end of the, tool 3, and in this way the point of the tool is pressed against the work W to cut into its face.

The ratio of this movement between the tool 3 and the stylus 2 is controlled by adjusting the collar 45 along the arm 44 of the bell-crank 36 or in some cases by varying theposition of the arm 94 longitudinally of the shaft 50,

see Fig. 3, as before explained. In this way the depth of cut of the tool may be regulated as required. p

As the pattern P feedsdo'wn across the point of the stylus 2 the recessed portions in its face will allow the stylus to be carried longitudinally forward and a corresponding displacement of the tool 3 is thereby effected whereby it will engrave a vertical line on the face of the work, see Fig. -.'l-. hen the point of the stylus meets a raised portion of the pattern it will ride out thereover thereby causing a corresponding withdrawal of the tool. In this man nor the tool is caused to engrave the parallel lines vertically along the face of the work returned to their raised position again by turning the wheel H back to rotate the shafts S, S, as at the first operation of adjusting them to starting position. Now, before'commencing the engraving of the next line on the piece the stylusand tool-holding carriages are fed to the right by means ofthe handle 27.- The differential gearing between the feed-shafts 15 and regulates the amount of the lateral feed of the stylus and tool in accordance with the difference in proportion between the pattern and work,

. and this ratio may be adjusted by-changing the gears to adapt them to reproduce edifferent sizes of design from a single pattern.

,By varying the turning movement of the feed-shafts under the control of the ratchetdevice, as previously explained, the spac ng between the engraved lines may be Varied as desired to produce either an open or close effect. In this manner the stylus is caused totraverse the whole face of the pattern in both directions and the tool engraves the work with a complete series of parallel,-

spaced-apart lines interrupted at predetermined intervals by blank spaces toprod-uce the brocaded effect as shown "in Fig. 9.

-My improved machine can thus be operated to reproduce a great variety of designs from different master patterns in accordance with any predetermined size of piece to be ornamented, as regulated by the changegear connections. hen. once adjusted the mechanism operates practically automatically and if desired might be. driven under powerthrough the use of suitable reversible clutch-devices as well known in diflierent arts.

Various modifications might be made in the stri'ictu'rc and arrangement of the parts of the apparatus without departing from the spirit or scope of the invention; therefore, without limiting myself to the exact embodiment herein shown and described, what I claim is 1. In an engraving machine, the combinabination with a pattern-blockhaving a relief design on its face, of means to support said pattern, means to support the piece to be engraved, means to reciprocate the pat ternand piece-supports with a differential rate of movement therebetween, a stylus for tracing the design on the pattern, means to mount said stylus to adapt it to be oscillated as it travels over the design, a tool adapted to be i'eciprocated to engrave the piece, and

means to communicate the motion of the stylus as it follows the contour of the pattern to operate the tool with a predetermined ratio between their vmovements in the manner and for the purpose substantially as described.

2. In an engraving machine, the combina tion with a pattern-block having a relief design on its face, of means to support said pattern, means to support the piece to be engraved, means to reciprocate the pattern- ,and piece-supports in alternately opposite (LlH'QClZlOHS, means providing for a change in ratio of movementbetween the patternand piece-supports, a stylus mounted adjacentthe pattern and arrai'iged to move in and out over the design, a tool adapted to be reciprocated to engrave the piece, means to communicate the motion of the stylus in following the contour of the pattern to operate the tool, and means for feeding the stylus and tool across the pattern and work with a differential ratio between their movements in accordance with the difference in size, be-

tween the pattern andthe space to be engrayed.

3. In an engraving machine, the combination with a pattern-block having a relief design on its face, of a sliding carriage for reciprocating the pattern, a sliding workcarriage'for reciprocating the piece to be engraved, means to reciprocate the patternand work-carriages, differential gearing connecting the reciprocating-means for the patternand workcarriages to cause them to be operated in unison at different rates of speed, a stylus for tracing the design on the pattern, means to mount the stylus to adapt it to be oscillated as it travels over the design, a tool for engraving the work, and means connecting the tool to be moved from the stylus as the latter follows in and out over the pattern.

4-. In an engraving machine, the combination with a pattern-block having a relief design on its face, of a sliding carriage for reciprocating the pattern, a sliding workcarriage for reciprocating the piece to be a tool for engraving the work, and means connecting the tool to be operated from the stylus as the latterfollows in and out over the pattern. i a I 5. In an engraving machine, the combination with a relief-designpattern, of a carriage for reciprocating the pattern,'a workcarriage for reciprocating the piece to be engraved, means for reciprocating the patternand work-carriages, gearing connecting the reciprocating-means for the carriages to operate in unison, interchangeable gears for altering the ratio of the gearing to adjust the ratio of movement between the two carriages, a stylus for tracing the design on the pattern during its reciprocation in relation thereto, means to mount said stylus to adapt it to be oscillated as travels over the design, and a tool connected to be operated from the movement of the stylus to engravethe piece duringthe reciprocation ofthe work-carriage in accord- I ance with a predetermined scale of reproduction. 7

6. In an engraving machine, the] combination with a pair of vertical standards, of a pattern-carriage slidable up and down on one of the standards, a work-carriage' slidable on the other standard, gear-racks 7 connected to the carriages, pin ons engaglng the racks, shafts. for rotating the pinions, gears on the shafts, 'a change-gear connecting the gears on the'sliafts to cause the latter to rotate together,a stylus arranged opposite the pattern carriage, means to mount said stylus to adapt it to be oscillated as it travels .over the pattern, 1a graving-tool ar ranged opposite the" work-carriage, and

means connecting the tool to be operated from the movement of the stylus a-sthe latter follows over the pattern during its reciprocation. I 7 In an engraving machine, the combination with two vertically-reciprocating carriages for traversingthe pattern and the Work to be engraved therefrom, of a stylus for tracing the pattern during its traverse in re lation thereto, a tool operated from the stylus to engrave the design on the work, a carriage for supporting the stylus in operative relation with the pattern, a carriage for supporting the'tool in operative relation with the Work, separate screw-shafts for feeding the stylusand tool-carriages laterally in relation to the pattern and Work, and differential gearing connecting the screw-shafts to rotate together at different rates of speed.

8. In an engraving machine,the combinationwith a reciprocating carriage for traverslng a pattern, ofa reciprocating work carriage for traversing the piece to be engraved, means for reciprocating said earriages in alternately opposite directions, r stylus for tracing the pattern during its traverse, a tool operated from the stylus to engrave the pattern-design onthe work, slidable carriages for supporting the stylus and tool, separate screw-shaft-sfor feedingthe stylus andtool-carriages laterally in relation to the pattern and work, gearing coir" nectingthe screw shafts to rotate together, andineans to allow a change in the ratio of the gearing to alter the ratio of feedbetv-ieen the stylus and tool. I o p 9. In an engraving machine, the combina tion with vertically slidable patternand work-carriages arranged: in parallel relation means to reciprocatesaid carriages in unison, an oscillative stylus for tracing the pattern, a reciprocable tool for engraving" the work, horizontally slidable carriages for supporting the stylus and tool, a rotary shaft extending between the carriages to connect the stylus to operate the tool under the influence of its movement in and out loverv the faceof the pattern while allowingthe stylusand tool-carriages to be displaced relatively to each other, and means for simultaneously slidmg the stylusand tool-car- ;riages to feed thenr at; different rates of movement. 7

10. In an engraving machine, the combination with the reciprocatin patternand work carriages, of means to reciprocate said carriages,,a slide arranged opposite the pattern-carriage, a second slide arranged oppo site the work-carriage, means to feed said slides laterally of the patternand worknation with the patternand work-holding means, of means to reciprocate said patternand work-holding means, two slides arranged opposite the pattern and work, a stylus mounted to oscillate on oneofthe slides, a graying-tool mounted to reciprocate on the other slide, means to feedthe slides relatively to the patterns and work-holding means, a shaft rockable, in bearings on both slides and slidable in one ofthem', means connecting the stylus to rock the'shaft, and

means connecting the shaft to effect. the reciprocation of the tool.

12. In an engraving machine, the combination With the patternand" work-carriages, of means to reciprocate said carriages, two slides adj ust-able in relation to the carriages, a bell-crank-lever pivoted 10n one of the slides, a stylus mounted on the bellcrank, a graving-tool mounted toreciprocatc in the other slide, a second bell-cranle lever to control the reciprocationofthe tool, and a rock-shaft connecting the two bellcranks to oscillate together. 1

13. In an engraving machine, the combination with the pattern and work-carriages, of means to reciprocate said carriages, stylusand tool-carriages adjustable in relation thereto, a bell-crank-lever pivoted on the stylus-carriages, a stylus supported thereby, a gravingj-tool mounted to slide in the tool-carriage, a rock-shaft extending between the carriages, means to connect the stylus-lever to oscillate the rock-shaft, a bell crank-lever on the tool-carriage connected to be oscillated from the rock-shaft. and means connecting said last-named bell-crank to control the sliding movement of the tool.

1- In an engraving machine, the combination with the patternand work-carriages, of means to reciprocate said carriages, stylusand toolcarriages adjustable inrelation thereto, a bell-crank-lever pivoted on one of the carriages, a stylus carried thereby, a rock-shaft extending between the stylusand tool-carriages, means connecting the stylus-lever to rock said shaft, a gravingtool slidable in the tool-carriage, a spring for sliding the tool toward the work, a bellcrank-lever connected to slide the tool against the action of the spring, and means connecting the rock-shaft to move the toollever under the action of the stylus-lever.

15. In an engraving machine, the combination with the patternand work-carriages, of means for reciprocating said carriages,"stylusand tool-carriages adjustable in relation thereto, a lever pivoted on thestylus-carriage, a stylus carried thereby,

a rock-shaft connected'to be oscillated from the stylus-lever, a tool-holder adjustable on the tool-car 'iage, a graving-tool slidable in the tool-holder, and means operated from the rock-shaft to slide'the tool from the movement of the stylus-leverwhile allowing the tool-holder to be moved back and forth on the tool-carriage.

16. In an engraving machine, the combination with the patternand work-carriages, of means for reciprocating said carriages, stylusand tool-carriages adjustable in relation thereto, a lever pivoted 0n the styluscarriage, a stylus supported thereby, a rock shaft connected to be rocked from said lever, a frame pivoted on thetool-carriage, means connecting the frame to be oscillated from the rock-shaft, a tool-holder adjustably mounted on the tool-carriage, a graving-tool slidable therein, abell-crank-lever on the tool-holder for sliding thetool, and

a spring acting against the tool to maintain the bell-crank-lever engaged with the rockablc frame on the tool-carriage while allowing the tool-holde'r to slide on said carriage. r

17. In an engraving machine, the combination with the patternand work-carriages, of means for reciprocating said carriages,

two slides adjustable in relation thereto, a stylus mounted to oscillate on one of the regulate the depth of its cut.

,18. In an engraving machine, the combination with the patternand work-carriages, of means to reciprocate said carriages, two slides adjustable in relation thereto, a bell-crank-lever pivoted on one of theslides, a stylus supported pendulously thereby, a rock-shaft extending between the slides, means connecting the'bell-crank to rock the shaft, means to adjustably maintain sa d connection to regulate the extent of movement of the shaft under the action of the bell-crank, a graviug-tool movably mounted on the other slide, and means to connect said tool to be actuated from the rock-shaft under the action of the stylusle'ver.

. 19. In an engraving machine, the combination with means for supporting a pattern and the piece to be engraved therefrom, 'of means to reciprocate the patternand piece-supporting means, two slides adjustable in relation thereto, a rock-shaft tending between the slides, a bell-cranklever on one of the slides connected to rock the shaft, a stylus supported on the bellcrank, a graving-tool mounted to oscillate on the other slide, a second bell-cra11klever to control the movement of the tool, a pivoted frame for. rocking the last named lever, and means'on the rock-shaft engaging the frame to operate the tool in the manner and for the purpose substantially as described; A j

20, In an engraving machine, the combination with means for supporting a patternand' the work to be engraved therefrom, of means to reciprocate the patternand work-supporting means, two slides adjustable in relation thereto, a rock-shaft connecting the slides, a lever pivoted on one of the slides to rock the shaft, a stylus supported on said level, a. tool-holder adjustably supported on the other slide, a gravingtool slidably supported in the tool-holder, a spring to press the tool against the work,

a gage on the tool-holder adapted to bear against the Work to regulate the position of the tool in relation thereto, and means connecting the rock-shaft to control the movement of the tool under the action of the stylus.

21. In an engraving machine, the combination with means for supporting a reliefpattern and the work to be engraved therefrom, of means to reciprocate the patternand work-supporting means, two slides Vadjustable laterally in relation to the pattern and work, an oscillating stylus on one of the slides, a reciprocable tool on the other slide, means connecting the stylus to actuate the tool under the influence of the relief-design on the pattern, and a gage on the tool-slide adapted to bear against the face of the work to maintain the tool normally away from contact therewit 22. In an engraving machine, the combination with means for supporting a relief pattern and the work to be engraved therefrom, of means to reciprocate the patternand work-supporting means, two slides ad- 'ustable laterally in relation to the pattern and work, an oscillating stylus on one of the slides adapted to follow the contour of the pattern, a rock-shaft extending between the slides, means connecting the stylus to rock copies of this patent may be obtained for the shaft, a tool-holder slidable on the other slide to adjust it toward or away from the work, a tool slidable in the holder, means connecting the rock-shaft to slide the tool under the action of the stylus, and means for rocking the shaft to withdraw the stylus from the pattern when the tool-holder is drawn away from the work.

23. In an engraving machine, the coma tool slidable in the tool-holder, means connecting the rock-shaft to slide the tool in its holder under the action of the stylus, a lever on the rock-shaft, and means on the tool-holder for rocking the lever to withdraw the stylus from the pattern when the tool is drawn clear back from the work.

In testimony whereof I affix my signature.

EARL R. MULOHAHEY.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

